CFP8 Mechanical Surface Characteristics. The mechanical surface of flat top CFP8 module which may be in contact with the host riding heat sink assembly shall be compliant with specifications in Table 5-1. The parameters listed in Table 5-1 define the CFP8 module thermal interface and may be used by host system designers to specify the host cage assembly opening and riding heat sink for optimizing host system thermal management performance. Surface flatness and roughness parameters are specified per CFP8 module power class (see Table 5-1) to allow for optimization of module thermal performance and cost. Non-compliance to these specifications may cause significant thermal performance degradation. Only the top surface of the module is assumed to be used for heat transfer. Table 5-1: CFP8 Mechanical Characteristics Parameters Power Class Min. Max. Unit Notes Weight 1 – 6 210 g Flatness 1 0.15 mm 2 0.15 mm 3 0.12 mm 4 0.12 mm Roughness 1 3.2 Ra 3 1.6 Ra Temperature Delta 1 - 4 7 °C No heat sink; 200 lfm sideways airflow Normal force exerted on module 1 - 4 5 15 N Heat sink on module top surface
CFP8 Mechanical Surface Characteristics. 36 8 5.3.2 CFP8 Insertion & Extraction 37 9 5.4 HOST SYSTEM DIMENSIONS 38 10 5.5 RIDING HEAT SINK 38 11 5.6 OPTICAL CONNECTORS 39
